Spark-plug.



F. H. WEINHAUER.

SPARK PLUG.

APPLICATION FILED 0OT.22,1908.

Patented Feb. 23, 1909.

' UNITED STATES, PATENT To all whom it Be it known a citizen of the Unit borough of Manha State of New York, h

rovement in Spark-Plugs, of which the folowing is a specification.

M invention relates to spark plugs commo y employed for the electrical ignition of the ex losive mixture in the cylinders of gas and oi engines, and particularly to a spark ed jump spark ty e in con- 0 that type of spar plug in WhlCll a break spark is employed, the object of the present invention being the provision nsu plug of the so-call tradistinction t of an improved means for i trical oint made between the end 0 the cable he shell terminal short circuiting between these parts, and oyment of a sleeve preferably of soft metal instead of fiber, which sleeve by a suitable bushing is forced into the insulating e and against the arts on between the she and in order to hold the cable mechanically and electricand t also in the empl covering of the cabl forming the insulati the shell terminal in position both ally.

In carrying preferably emp the shell I em lnsulating sleeve wit means within the she to hold the parts in p0 the cable in el shell terminal,

ing) the joint ca le and the rounding the mediate of th hereina ter more In the drawing, tudinal section ill may concern:

I, FRED H. WEINHAUER, ed States, residing in the ttan, city, county, and

loy a she or body adapted to e connected 1n and to the cylinder head of the gas, oil or other explosive engine, and this shell as is customary, comprises the ground terminal of the spark plug. Within ploy a shell terminal and an insulatmg sleeve, means whereby the shell terminal is secured in the insulating sleeve, means for securing the shell terminal and its hin the shell, a cable,

ectrical contact with the said an insulating tube surroundmade between the end ofthe shell terminal, and a barrel sursaidinsulating tube and intere same and the interior of the shell; the said means for gripping the'cable being also adapted to bear a ainst the extremity of the said barrel, al of which is particularly described.

Figure 1 is a central longi ustrating my improved ark plu Fig. 2 is a section on line a, 9;, 1 g 1 ig. 3 is'a section of the collar preferably made of soft metal employed to 'grip the cable in position within the shell of the FRED H. WEINHAUER, OF NEW YORK, ii. Y. SPARK-PLUG.

Specification of Letters Patent. Application filed October 22, 1908. Serial No. 458,920.

ave invented an Imtion at the coil box.

adapted to be receive plosive engine,

in order to prevent screw-threaded.

end of which latter resent invention, I

imme iatel within t for grip ing the cable sition with the end of Referring to the 'dra the shell or body of the spark plug, which at one end 11 is exteriorl the head of the gas, oil

shoulder 16 between the bores 13 and furthermore, the bore 1 17 designates a sleeve of insul terial which centrally is longitudinal aperture or ore adapted to receive a shell electrode indie spark in 19 preferably FF oE.

Patented Feb. 23, 1909.

plug. Fig. 4 is a partial longitudinal section showing the positions of the parts before the collar is forced into p and Fig. 5 is an elevati of the end of the cable and t e ni ployed thereon in making electrica lace by the bushing, on and artial section screw threaded and and so connected in or other similar ex- The end 11 of the shell is provided with a bore indicated at 12. bore 12 extends along Within the shell an atin the eleca preciable distance and is then enlarged to tl fe diameter of the bore 13, thereby forming a shoulder 14, and the bore in the outer end of the shell is indicated at 15; there being a and 15, 5 is interiorly receive a nut 22 by 1 be understood, the 11 terminal is drawn packing ring 21 to ple emconnecwing 10, indicates ating marovided with a ated at 18, one is provided with a so placed as to come e inner extremit the screw-t eaded portion 11 of the she The shell terminal 18 is provided with a peripheralflange 20 adapted to fit within one end of the longitudinal aperture in the insulating sleeve which is enlarged to receive the same, and 21 represents a rin placed between the flange 20 jacent shoulder in the insulatin the opposite end of th tending slightly beyond the insulating sleeve and screw-threaded to means of which, as wil flange .20 on the she down tight against the form a tight joint between these parts.

One end of the insulati to fit within the bore threaded end of the shell this part of the sleeve the same is provided with a flange adapted to fi 13 of the shell; a ring of 23 being emplo ed to make a tight joint between the said ange and the shell by hearing against the flange and the shoulder 14. On the opposite end of the sleeve 17, of appreciably smaller diameter, roundmg'the same, I employ a washer 24 g of packing and the adg sleeve 17 e shell terminal exng sleeve is adapted 12 of the screw and adjacent to t Within the bore packing material preferably and surand between the washer and the adjacent portion of the sleeve 17 and shoulder 16 I also employ a ring of packing material indicated at 25.

26 designates a thimble provided centrally with an aperture of suflicient diameter for the reduced end of the sleeve 17 to pass through freely, and exteriorly this thimble 26 is screwthreaded and adapted to be received Within the shell 10 and to be turned down therein against the washer 24- to force the same against the packing material 25 and in turn to force the sleeve 17 against the packing material 23 in order that tight joints may be made between these parts and the sleeve 17, and the shell electrode 18 firmly secured in place within the shell, and the thimble 26 may be provided with recesses 27 adapted to receive lugs provided on the extremity of a suitable tool in order that the thimble may be readily turned and screwed to position within the bore 15 of the shell 10. Within the bore 15 I also employ a barrel 28 preferably made of metal and of such a diameter as to fit snugl within the said bore; the lower end of t e barrel 28 rests upon the outer surface of the thimble 26 and the upper end is provided with an internal flange 29.

Within the barrel 28 I employ a tube 30 preferably made of glass or other equally good insulating material and the outer diameter of the tube 30 is such that the same fits snugly within the barrel 28 be.

neath the flange 29 thereof while the inner diameter of the barrel 30 is of such a diameter as to receive an insulating covering of the cable employed to connect the plug with the coil box.

31 designates a collar adapted to fit over the cable and preferably made of lead or an alloy thereof, or any other suitable soft metal. It will be noted however, that the collar 31 is approximately of the same diameter as that of the bore 15 and the inner diameter of the collar is preferably the same as the outer diameter of the cable employed,

so that the collar fits snugly over the cable and may be seated within the shell against the flange 29.

32 designates a screw-threaded bushing adapted to engage'the screw threads of the bore 15 and provided with a flat-sided head 33 by means of which the bushing may be turned.

34 designates the conductor wire in the cable employed, while 35 indicates the insulating sheath thereof, and 36 its outer cover which is customarily made of fabric.

As indicated in Fig. 4, the cable is passed through the bushing 32, through the collar 31 and the end thereof is passed into a recess provided therefor in the outer extremity of the shell electrode 18; a portion of the insulating sheath being cut away for this purpose and a further portion of the cover being cut away so that the insulating sheath of the cable may pass into the insulating tube 30 sufficient of this covering being cut away to permit the extremity of the insulating sheath to bear against the nut 22 and the extremity of the cable cover 36 to extend substantially through the collar 31.

It will be noted that the bushing 32 is interiorly beveled and the outer surface of the collar 31 is also beveled, and it will be understood that when the bushing is turned down within the shell 10, the collar 31 from the nature of the soft metal of which it is made will be forced to assume approximately the )osition shown in Fig. 1, in which the metal is forced into the adjacent screw threads, against the face of the flange 29 on the upper end of the barrel 28, and also into the cover 36 and insulating sheath 35 of the cable.

This as hereinbefore intimated not only forms a strong mechanical joint between the cable and the shell plug, but also forces the end of the cable into firmelcctrical contact with the shell electrode 18 and maintains the same in position therein.

At the opposite end of the cable or that to which connection is made with the coil box, I prefer to employ a nipple indicated at 37, Fig. 5, in order to obviate any possible short circuiting between the ground electrode and the shell electrode.

I claim as my invention:

1. A spark plug comprising a shell, a shell electrode, means for securing the shell electrode within the shell, means for connecting a cable both mechanically and electrically within the said shell and to the shell electrode a barrel and an insulating tube, the one within the other and both within the said shell and surrounding the joint between the said cable and the said shell electrode.

2. A spark plug comprising a shell, a shell electrode adapted to receive and make connection with one end of a cable, means for securing the said shell electrode within the said shell, a collar of soft metal adapted to fit within the said shell, means for forcing a portion of the said collar into the cover of the cable to secure the same to the plug, and means for insulating the joint between the said shell electrode and cable from the said shell.

3. A spark plug comprising a shell, a shell electrode adapted to receive and make electrical connection with the end of a cable, means for securing the shell electrode within the said shell, a barrel fitting within the said shell, a tube within the said barrel, both of said parts surrounding the joint between the shell electrode and the end of the cable, a collar of soft metal surrounding the cable and fittingwithin the said shell and means for forcing the said collar into the cover of the cable and against the said barrel to secure the cable in position and maintain theelecl 4 shell electrode within'the insulating sleeve, a

erases tric'al connection between the cable and the shell electrode.

4. A spark plug comprising a shell, a shell electrode adapted to receive and make electrical connection with the end of a cable, a sleeve of insulating material, means for securing the shell electrode within the insulating sleeve, means for securing the insulating sleeve and its shell electrode within the said shell, a barrel fitting within the said shell, a tube within the said barrel, both of said parts surrounding the joint between the shell electrode and the end of the cable, a collar of soft metal surrounding the cable and fitting within the said shell and means for forcing the said collar into the cover of the cable and against the said barrel tosecure the cable in position and maintain the electrical connection between the cable and the shell electrode.

5, A spark plug comprising a shell, a shell electrode adapted to receive and make electrical connectlon-with the end of a cable, an insulating sleeve, means for securing the thimble adapted to screw said shell to secure the insulating sleeve and shell electrode in osition, a barrel fitting within the said she I, a tube within the said barrel, both of said arts surrounding the joint between the shell electrode and the end down within the of the cable, a collar of soft metal surrounding the cable and fitting within the said shell and means for forcing the said collar into the cover of the cable and against the said barrel to secure the cable in position and maintain the electrical connection. between the cable and the shell electrode.

6. A spark plug comprising a shell, a shell electrode adapted to receive and make electrical connection with the end of a cable, an insulating sleeve, means for securing the shell electrode Within the insulating sleeve, a thimble adapted to screw down within the said shell to secure the insulating sleeve and shell electrode in osition, a barrel fitting within the said she I, a tube within the said barrel, both of said arts surrounding the joint between the shell electrode and the end of the cable, a collar of soft metal surrounding the cable and fitting within the said shell, and a screw-threaded bushing adapted to be turned down in said shell and force said collar into the cover of the cable and against the osition. ay of October FRED H. WEINHAUER. Witnesses:

' Gno. T. PINoKNEY,

E. ZAOHARIASEN. 1

barrel to secure the parts in Signed by me this 12th 1908. 

